Add interface support to EmptyClassTransformer

Signed-off-by: Graham <gpe@openrs2.dev>

deob/src/main/java/dev/openrs2/deob/transform/EmptyClassTransformer.kt

@@ -4,7 +4,6 @@ import com.github.michaelbull.logging.InlineLogger
 import dev.openrs2.asm.classpath.ClassPath
 import dev.openrs2.asm.classpath.Library
 import dev.openrs2.asm.transform.Transformer
-import org.objectweb.asm.Opcodes
 import org.objectweb.asm.Type
 import org.objectweb.asm.tree.ClassNode
 import org.objectweb.asm.tree.FieldNode
@@ -30,7 +29,7 @@ class EmptyClassTransformer : Transformer() {
     }
 
     override fun transformClass(classPath: ClassPath, library: Library, clazz: ClassNode): Boolean {
-        if (clazz.access and Opcodes.ACC_INTERFACE == 0 && clazz.fields.isEmpty() && clazz.methods.isEmpty()) {
+        if (clazz.fields.isEmpty() && clazz.methods.isEmpty()) {
             emptyClasses.add(clazz.name)
         }
 
@@ -38,6 +37,10 @@ class EmptyClassTransformer : Transformer() {
             referencedClasses.add(clazz.superName)
         }
 
+        for (superInterface in clazz.interfaces) {
+            referencedClasses.add(superInterface)
+        }
+
         return false
     }